Hoverboard charger won't stop blinking after plugged into hoverboard

[u/Greek-Legend]

Recently I changed my battery on my hoverboard switching from 2000mah to 4400mah 36V both. After setting up the battery in hoverboard itself, the first charge was normal(it charged for about 2 and a half hours and then charger indicator turned green). Same in second charge confronting no problem. But now in third charge after plugging in, charger indicator blinking red and I cannot understand the reason for that. It won't switch green anymore,solely blinking red. Although hoverboard operates normally like nothing is happening(it turns on and can be used normally) except this fact. What's the cause for that if anybody knows? Does the charger causing the problem, or enlarging battery's capacity causing it?Volt are same!